Think what is being said is that when the front knees is over the toe the upper body is relaxed and the knees are full it's a 100% power stance linking from top to bottom since the elbows are harmonized with the knees While pulling the shoulder back would result in 50% less power and calorie burning just trying to maintain balance since the big muscle contraction is weak including the balance and structure the result is struggling. This is why Moore said everything restarts with the weight over the front.
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